Elastic tire for the wheels of vehicles.



P. E. BLAISDELL. ELASTIC TIRE PoR THE WEBLS op VEHICLES.

Patented Aug. 20, 1912.

APPLICATION FILED AUG. 10, 1909.

//v VEA/70m W Y fw Y UNITED FREDERICK ELIJ'AH BLAISDELL, 0F HAMMERSMITH, ENGLAND.

ELSTIC TIRE FOR THE WHEELS 0F VEHICLES.

'Specification of Letters Patent.

Patented Aw. 20,1912.

v.Applicationtiled August 10, 1909. Serial No. 512,172.

v To all whom it may concern Be it known that I, Fnnniinicii EniJAH BLAISDELL, citizen of the United States, iesiding at West Lodge Works, Lower Mall, Hammersmith, iii the county of Middlesex, England', have invented new and useful Improvements in Elastic Tires for the Wheels of Vehicles, of which the following is aV specification.

This inveiit-ion relates construction of elastic tire for a Wheel, the core of which is built up of a plural winding of a stretched ribbon of vulcanized rubber on a central support.

The ribbon or tape, prioi` tol the winding, is rendered' adhesive by a layer of rubber solution with the addition of a sutlicient quantity of sulfur to effect the vulcanization of the rubber contained in the solution, the solvent being evaporated before the Winding takes place. The core thus constructed is in a condition to withstand a viilcanizing heat without a material loss of the stored mechanical energy.-

According to a preferred forln of construction tlie core is forniedas an elongated cylinder of energized vulcanized rubber in a manner which will be described with reference to the accompanying drawing, the ends thereof being subsequently united to form a eontiniioiis ring of uniform Section.

In this drawing F igure l is a sectional side elevation of a'portion of a tire, and Fig. 2 is a section thereof.

On a cylinder rl, of vulcanized rubber or rul'iber-compound which is in an unst-rained condition, a r'ibbon of vulcanized rubber b, one or both surfaces`of which have been prepared for adhesion .by the addition of a layer of rubber solution and sulfur, is wound in tension in an oblique direction so as to cause it to wrap itself iii a helical manner with the edges of consecutive convolutions butting against cach other so 'as to completely inclose the cylinder. ln j'ierforining this operation the ribbon of rubber b is caused to be traversed from one end to the other, the pitch of the helical. convolution being right-handedsuppose, after which the to an improved winding is rrepeated with a left-handed convolution, thereby overlapping in a crossed manner the butting edges of the previous winding and so on successively. As the increases 1n diameter and also in length, the

the ribbon-wound coreY latter increase being due to the very intense' squeeze to which the heart of the core becomes subjected by the tension applied to the ribbon in the wrapping process.

The effect of the longitudinal strain due to the squeezing4 action of th'e tension of the louter layers is to provide a continuing tendency to close, in the direction of the length of the periphery o' the tire.'any incision which may be made in its surface.

The product of the operation above described is an elongated cylinder of uniform diameter, the major portion of which consists of vulcanized rubber having stored thereinra relatively considerable amount of mechanical energy by virtue of thestretched condition of its component layers and in which the internal straining actions are such that, in each unit length of the cylinder, they balance yeach other independently of its connection to the adjoining portions of the Vlength of the cylinder. llloreover the energized mass of rubber is in such a condition of strain that instead of gaping by an incision of its surface, a wound made by an instrument will tend to close up.

To insure the complete adhesion together of the consecutive layers, the strained mass is subjected to a vulcanizing temperature.

The ring or hoop may be provided with a tread c, to take the wear of the road, which tread can be vulcanized to the energized core and be renewed when worn.

To the energized core, or to the t-read vulcanized'thereto, can also be secured beaded edges of hard rubber (l fortified with canvas e to serve as means of connection to the rim of the wheel in one of the usual i 'nys at present employed.

An energized ring oi hoop, manufacturedwound around to the layers as to unite them to form a continuous mass.

2. A resilient tire for o wheel including a. ring-core composed of a plurality of superposed helical wrappings of a ribbon of stretched vulcanized rubber wound around a yielding central element of vulcanized l rubber and between each two adjacent layers of the helically wound ribbon a lm of vulcanized rubber soattached to'lthe ,layers 10 as to unite them to lform a continuous mass.

In testimony whereof I have signed my FREDERICK ELIJAH BLAISDELL. l Witnesses: I

F. L. RAND,

R.' J. l/VILLIAMS.

M l Copies of this patent may be obtained for live cents each, by addressing the Commissioner of Patents.

Washington, I). C. 

